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Título: | Dielectric properties of water in amorphous mixtures of polymers and other glass forming materials |
Autor: | Cerveny, Silvina CSIC ORCID ; Colmenero de León, Juan CSIC ORCID; Alegría, Ángel CSIC ORCID | Palabras clave: | Calorimetry Hydration Water |
Fecha de publicación: | 2007 | Editor: | Elsevier | Citación: | Journal of Non-Crystalline Solids 353(47–51): 4523-4527 (2007) | Resumen: | We report on the dielectric and calorimetric results of water solutions of poly(vinyl methyl ether) (PVME), poly(vinyl pyrrolidone) (PVP), pentaethylene glycol (5EG) and tri-poly(propylene glycol) (3PG) for a temperature range of 130 K up to crystallization. For 3PG and 5EG two relaxation processes (Process I and II) were observed for all the hydration levels whereas for PVME and PVP a single peak was detected (Process II). We will show that the temperature dependence of the relaxation time of Process II, related to water molecules dynamics, presents a crossover at a temperature about the calorimetric glass transition of the whole system. We show that this crossover could be interpreted in terms of confinement effects due to the frozen-in of the whole solution. Finally, in spite of the fact that water molecules are surrounded by different environments, the results are very similar for the all the investigated systems, which suggest a general behavior for confined water. From this finding, we have obtained an intrinsic value of the activation energy for water dynamics in confining environments. | Versión del editor: | https://doi.org/10.1016/j.jnoncrysol.2007.03.039 | URI: | http://hdl.handle.net/10261/224355 | DOI: | 10.1016/j.jnoncrysol.2007.03.039 | ISSN: | 0022-3093 |
Aparece en las colecciones: | (CFM) Artículos |
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